DO-LOOP

DO-LOOP

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Action

Repeat a block of statements until condition is true.

 

 

Syntax

DO

 statements

LOOP [ UNTIL expression]

 

 

Remarks

You can exit a DO..LOOP with the EXIT DO statement.

The DO-LOOP is always performed at least once.

 

The main part of your code can best be executed within a DO.. LOOP.

You could use a GOTO also but it is not as clear as the DO LOOP.

Main:

  '  code

GOTO Main

 

Do

  ' Code

Loop

 

Of course in the example above, it is simple to see what happens, but when the code consist of a lot of lines of code, it is not so clear anymore what the GOTO Main does.

 

 

See also

EXIT , WHILE-WEND , FOR-NEXT

 

 

Example

'-----------------------------------------------------------------------------------------

'name                     : do_loop.bas

'copyright                : (c) 1995-2016, MCS Electronics

'purpose                  : demo: DO, LOOP

'micro                    : Mega48

'suited for demo          : yes

'commercial addon needed  : no

'-----------------------------------------------------------------------------------------

 

$regfile = "m48def.dat"                                   ' specify the used micro

$crystal = 4000000                                         ' used crystal frequency

$baud = 19200                                               ' use baud rate

$hwstack = 32                                               ' default use 32 for the hardware stack

$swstack = 10                                               ' default use 10 for the SW stack

$framesize = 40                                             ' default use 40 for the frame space

 

Dim A As Byte

 

A = 1                                                       'assign a var

Do                                                         'begin a do..loop

Print A                                                   'print var

Incr A                                                   'increase by one

Loop Until A = 10                                           'do until a=10

End

 

'You can write a never-ending loop with the following code

Do

'Your code goes here

Loop